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https://issues.apache.org/jira/browse/IGNITE-28842?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Anton Vinogradov resolved IGNITE-28842.
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Resolution: Fixed
> Restore parallel codestyle build (-T 1C) and report compilation failures
> clearly
> --------------------------------------------------------------------------------
>
> Key: IGNITE-28842
> URL: https://issues.apache.org/jira/browse/IGNITE-28842
> Project: Ignite
> Issue Type: Task
> Reporter: Anton Vinogradov
> Assignee: Anton Vinogradov
> Priority: Major
> Time Spent: 50m
> Remaining Estimate: 0h
>
> h3. Background
> The "Check java code" codestyle job intermittently looked broken with ~288
> \{{cannot find symbol}} errors for annotation-processor-generated classes
> (\{{*ViewWalker}}, \{{*MessageSerializer}}, \{{IDTOSerializerFactory}}). Root
> cause: a single *real* compile error in a stale PR branch (e.g. a removed
> method still referenced after a clean text merge). javac drops all
> annotation-processor output when a compilation round has errors, so one real
> error cascades into hundreds of generated-class "cannot find symbol" errors
> that bury it.
> IGNITE-28840 and IGNITE-28841 chased this as a build-infra/parallelism
> problem; both were misdiagnoses. IGNITE-28841 in particular dropped the \{{-T
> 1C}} parallel build added by IGNITE-28823. \{{-T 1C}} was never the cause
> (the failure reproduces single-threaded).
> h3. Change
> 1. Restore \{{-T 1C}} on the codestyle / \{{test-compile}} step (re-applies
> the IGNITE-28823 speed-up).
> 2. On compilation failure, make the job state it plainly and surface the real
> error: a GitHub \{{::error::}} annotation ("compilation failed, not a
> checkstyle violation"), plus a collapsible group listing likely root-cause
> errors with the generated-class cascade
> (\{{*Walker}}/\{{*Serializer}}/\{{*Factory}}, \{{internal.systemview}},
> \{{codegen.idto}}) filtered out. Checkstyle-only failures are unaffected.
> h3. Verification
> Filtering validated against a real failing build log (PR #13298 merge): from
> 288 errors it surfaces exactly the real one — \{{IgniteTxManager:[148,1]
> cannot find symbol: static deriveSyncMode}}.
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